Abrasive roll



Patented Apr. 10, 1928.

UNITED STATES PATENT OFFICE. 7

DAVID C. SCOTT, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR, BY MESNE ASSIGN-' MENTS, TO HENRY L. SCOTT COMPANY, OF PROVIDENCE, RHODE ISLAND, A. COR- PORATION OF RHODE ISLAND.

ABRASIVE ROLL.

Application filed November 9, 1925. Serial No. 67,855.

face of the cylinder or roll.

A still, further object of the invention is the provision of slot in the cylinder through which the ends of the strip about the cylinder may extend, and the provision 16v of means within the cylinder for gripping the ends of the strip and exerting a tensioning action thereon to draw the strip tightly around the surface of the cylinder to take up the slack or stretch thereof A still further object of the invention is the provision 0f-a pair of jaws within the cylinder for gripping the ends of the strip which extend through the slot in the surface of the cylinder and the means for exerting a drawing-in spring tension on the jaws to take up the looseness or stretch of the strip.

With these and other objects in view, the invention consists of certain novel features of construction, as will be more fully described, and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side elevation illustrating my improved abrasive roll with the tension ing mechanism mounted therein.

Figure 2 is a section on line 2-,2 of Figure 1, also showing the cam operating wrench in dotted lines.

Figure 3 is a section on line 33 of Fig ure 1, showing the gripping. jaws and the spring arms as connected to these j aws with the jaw-closing pins behind the spring arms.

Figure 4 is a perspective view showing the pair of jaws detached.

Figure 5 is a perspective view showing the cam member which applies tension to the spring arms.

Figure 6 is a perspective view illustrating a portion of the cam-operating wrench.

Figure 7 is a perspective view illustrating the pair of aws with the two pairs of spring arms for operating the jaws.

It is found in the practical construction and operation of abrasive wheels or rolls of this character in which a strip or sheet; of abrasive material is applied to the surface, of advantage to provide a slot in the surface of the cylinder through which the ends of the embracing strip or sheet may extend and to provide means within the cylinder for gripping'the ends of this abrasive strip and to apply tension thereon for the purpose of drawing the abrasive strip tightly about the surface of the roll and also to take up any stretch in the material during operation, as the working life of the abrasive strip depends largely upon its be- 1ug held tightly againstthe supporting surface of the cylinder; and to accomplish this 1n a simple and effective way, I have provided a pair of jaws for gripping the ends of the strip, and a cam or eccentric acting through a pair of arms serving to close the jaws and also to exert a spring tension upon the jaws tending to flexibly exert a radial tensioning upon the strip to takeup its slack and stretch; and the following is a detailed description of the present embodiment of my-invention and showing one construction of mechanism by which the above advantageous results may be accomplished With reference to the drawings, 10 is a roll or cylinder having a central web 11 with a recess 12 formed therein near its periphery, also a hub 13 is supported on this web for the reception of the driving shaft 14 on which the roll is mounted.

This cylinder is provided with a slot 15 through its periphery hich communicates with the opening 12 within. i

In this opening 12 is mounted a pair of jaws 16 slotted as at 17 to receive and be which ends are connected to these pockets either by solder or other suitable means. The arms of these yokes are each provided with a resilient loop or coil 21 and these arms are connected by a bridge portion 25 and the backs of these arms are set on an iIbcline as at 31 and this inclined surface is set to engage the guide pins 32 which extend through and are secured in the web 11.

In order to engage the bridge portion of the yoke members and exert a tension on these arms, I have provided a cam bar 26 in the rotatable member 27 so that when this bar is turned into the position illustrated in Figure 1, by the key 28 a tension. is exerted on the yoke, which tension performs a double function, first, it draws the yoke inwardly from the dotted line to the i ull line position and this inward movement serves to draw the inclined surface of the arms to engage the pins 32, which action serves to close the jaws to securely bite the ends 33 of the abrasive material 34 which surrounds the cylinder, and this tensioning of these yokes also serves to reduce the coils 24 by which construction constant yielding yet firmly drawing action is exerted upon the ends or this abrasive material to draw it tightly about the surfaceof the roll to take up any "stretch or looseness which may occur in the stretch which may be formed therein while Y in operation.

The foregoing description is directed solely towards the construction illustrated, but

I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is suscep: tible, the invention being defined and limited only by the terms of the appended claims.

1.-An abrasive roll comprising slotted cylinder about which an abrasive strip may be positioned with an end extending inward through the slot, a pair of jaws for engaging said end; a yoke-shaped member of resilient material having side arms so formed that they are of themselves resilient both laterally and longitudinally and which are connected to said jaws, a cam for applying a drawing-in tension on said jaws through said resilient yoke arms, and means cooperating with the cam to cause tliejaws [to engage and hold the end ofthe'sandpaper as the cam draws the aws' inward. j

2. An abrasive roll comprising a slotted cylindrical body about which the abrasive strip may be passed with its ends eXtending inward through said slots, a pair of jaws within the cylinder, yoke shaped member formed of resilient wire having side arms each with a loop therein to cause them to be of themselves resilient, said arms being connected to said jaws, a cam fd'r exerting a drawing-in tension on said jaws through said yoke arms, and means cooperating with the cam to cause thejaws to engage and hold the end of the sandpaper as the jawsinward. V f

In testimony whereof I afiix mysignature.

the cam draws DAVID C. SCOTT. 

